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Purchased Loans - Loan Portfolio by Risk-rating Grades (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 9,083,129 | $ 7,620,322
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,295,912 | 1,039,393
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 740,668 | 633,389
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,795,343 | 2,343,721
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,051,509 | 3,427,530
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 199,697 | 176,289
Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,693,417 | 2,031,766
Purchased | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,852,090 | 1,284,431
Purchased | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,746,683 | 1,241,834
Purchased | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 84,250 | 24,595
Purchased | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 21,157 | 18,002
Purchased | Commercial, financial, agricultural | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 369,748 | 248,993
Purchased | Commercial, financial, agricultural | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 333,147 | 241,195
Purchased | Commercial, financial, agricultural | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 33,857 | 4,974
Purchased | Commercial, financial, agricultural | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,744 | 2,824
Purchased | Real estate – construction | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 101,964 | 81,220
Purchased | Real estate – construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 101,122 | 81,220
Purchased | Real estate – construction | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Purchased | Real estate – construction | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 842 | 0
Purchased | Real estate – 1-4 family mortgage | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 128,806 | 100,039
Purchased | Real estate – 1-4 family mortgage | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 113,874 | 91,369
Purchased | Real estate – 1-4 family mortgage | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 7,347 | 2,498
Purchased | Real estate – 1-4 family mortgage | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 7,585 | 6,172
Purchased | Real estate – commercial mortgage | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,251,570 | 853,498
Purchased | Real estate – commercial mortgage | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,198,540 | 827,372
Purchased | Real estate – commercial mortgage | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 43,046 | 17,123
Purchased | Real estate – commercial mortgage | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 9,984 | 9,003
Purchased | Installment loans to individuals | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2 | 681
Purchased | Installment loans to individuals | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 678
Purchased | Installment loans to individuals | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Purchased | Installment loans to individuals | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 2 | $ 3

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